PCNA and hydrops fetalis: Proportional time spent in the stone yard positively correlated with PCNA expression over the whole HF [F(1, 46.6) = 6.54, p = 0.014, B = 0.0018, SEM = 0.003], and there was an interaction with subregion [F(1, 44.7) = 4.57, p = 0.038].